性能优化，减少Lambda闭包分配

MesETL.App/Services/DataRecordQueue.cs

@@ -52,8 +52,14 @@ public class DataRecordQueue : IDisposable
     {
         var charCount = record.FieldCharCount;
         LongestFieldCharCount = Math.Max(LongestFieldCharCount, charCount);
-        if(_currentCharCount + charCount > _maxCharCount)
-            await TaskExtensions.WaitUntil(() => _currentCharCount + charCount < _maxCharCount, 50);
+        if (_currentCharCount + charCount > _maxCharCount)
+        {
+            // 不用Task.WaitUntil是为了防止产生Lambda闭包
+            while (!(_currentCharCount + charCount < _maxCharCount))
+            {
+                await Task.Delay(50);
+            }
+        }
         _queue.Add(record);
         Interlocked.Add(ref _currentCharCount, charCount);
         OnRecordWrite?.Invoke();

MesETL.App/Services/ETL/CsvReader.cs

@@ -133,7 +133,7 @@ public class CsvReader : IDataReader
             
             if (!hasQuote && currChar == delimiter)
             {
-                result.Add(source[start..(end)].ToString());
+                result.Add(source[start..(end)].ToString()); // 超大型字符串会在LOH中分配内存，没救
                 start = end + 1;
                 ++end;
             }